cos(2tan^-1 1/5) *evalutate the expression without using a calculator

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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cos(2tan^-1 1/5)

*evalutate the expression without using a calculator

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cos(2tan^-1 (1/5))

Evaulate the expression without using a calculator.

*the -1 is attached to the tangent as an exponent. sorry if i made it seem like 115.

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